Three are pipe threads (NPT/NPTF, BSPT, BSPP) and three are not (UN/UNF, metric parallel, ... For pipe threads, determine nominal size by comparing the part against a size profile.

Plain ol’ National Pipe Tapered (NPT) ... -Straight-Thread O-Ring Fittings are the ones you thread into place, then tighten a nut on the fitting against an 0-ring built into the fitting.

Emuge is a subsidiary of Emuge-Werk Richard Glimpel GmbH & Co. KG that manufactures taps, end mills, thread mills, holders, and attachments, with over 12,000 types of cutting tools and accessories in ...

All NPT threaded conduit and fittings shall be threaded with a National (American) Standard Pipe Taper (NPT) thread. NPT threaded entries into explosionproof equipment shall be made up with at least ...